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Using a fingertip tactile device to substitute kinesthetic feedback in haptic interaction
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
First results on the role of cutaneous feedback during the learning of a force field in reaching tasks
No full textAccording to International Labour Organization (ILO), more than two million
people die or loose the working capability every year because of accidents or work-related
diseases. The insufficient degree of interaction between human and machine (HMI) is one
of the major causes. Developments in HMI have been achieved in several fields of robotics
research. However, the translational relevance of such innovations is often underestimated.
To date, several findings have generated some preliminary indications about the way to
facilitate learning of motor tasks with the assistance of robotic devices. This general goal,
initially raised by the community of rehabilitation robotics researchers, is also extendable to
different application fields since faster learning of a task by the user means more productivity
and safety. Haptic stimulation can help humans learn perceptual motor skills, but the
precise way in which it influences the learning process has not yet been clarified. This study
investigates the role of the kinesthetic and cutaneous components of haptic feedback during
the learning of a viscous curl field, taking also into account the influence of visual feedback.
Results indicate that kinesthetic stimuli played a primary role during motor adaptation to
the viscous field, which is a fundamental premise to motor learning and rehabilitation. On
the other hand, cutaneous stimulation alone appeared not to bring significant direct or
adaptation effects, although it needs further investigations. The experimental conditions
with visual cancellation of position error seems to show slower adaptation rates, indicating
that visual feedback actively helps to the formation of internal models. However, modest
learning effects were shown when the visual information was used to substitute the viscous field
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Effects of kinesthetic and cutaneous stimulation during the learning of a viscous force field
No full textHaptic stimulation can help humans learn perceptual motor skills, but the precise way in which it influences the learning process has not yet been clarified. This study investigates the role of the kinesthetic and cutaneous components of haptic feedback during the learning of a viscous curl field, taking also into account the influence of visual feedback. We present the results of an experiment in which 17 subjects were asked to make reaching movements while grasping a joystick and wearing a
pair of cutaneous devices. Each device was able to provide cutaneous contact forces through a moving platform. The subjects received visual feedback about joystick’s position. During the experiment, the system delivered a perturbation through (1) full haptic stimulation, (2) kinesthetic stimulation alone, (3) cutaneous stimulation alone, (4) altered visual feedback or (5) altered visual feedback plus cutaneous stimulation. Conditions 1, 2 and 3 were also tested with the cancellation of the visual feedback of position error. Results indicate that kinesthetic stimuli played a primary role during motor adaptation to the viscous field, which is a fundamental premise to motor learning and rehabilitation. On the other hand, cutaneous stimulation alone appeared not to bring significant direct or adaptation effects, although it helped in reducing direct effects when used in addition to kinesthetic
stimulation. The experimental conditions with visual cancellation of position error showed slower adaptation rates, indicating that
visual feedback actively contributes to the formation of internal models. However, modest learning effects were detected when the visual information was used to render the viscous field
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